GNU bug report logs - #47674
dnsmasq is vulnerable to CVE-2021-3448

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Nicolò Balzarotti <anothersms <at> gmail.com>
Subject: bug#47674: closed (Re: bug#47674: dnsmasq is vulnerable to
 CVE-2021-3448)
Date: Fri, 09 Apr 2021 19:35:02 +0000

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Your bug report

#47674: dnsmasq is vulnerable to CVE-2021-3448

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 47674 <at> debbugs.gnu.org.

-- 
47674: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=47674
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Leo Famulari <leo <at> famulari.name>
To: Nicolò Balzarotti <anothersms <at> gmail.com>
Cc: 47674-done <at> debbugs.gnu.org
Subject: Re: bug#47674: dnsmasq is vulnerable to CVE-2021-3448
Date: Fri, 9 Apr 2021 15:34:34 -0400

On Fri, Apr 09, 2021 at 05:10:43PM +0200, Nicolò Balzarotti wrote:
> From a0932442c6c72d1e1a2a0f400f8afa487251189d Mon Sep 17 00:00:00 2001
> From: nixo <nicolo <at> nixo.xyz>
> Date: Fri, 9 Apr 2021 16:19:03 +0200
> Subject: [PATCH] gnu: dnsmasq: Update to 2.85.
> 
> * gnu/packages/dns.scm (dnsmasq): Update to 2.85.

Looks like this change was already done with commit
c8d809f9a49c2b4ec5500c2685e96168dcd9afa9

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From: Nicolò Balzarotti <anothersms <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: dnsmasq is vulnerable to CVE-2021-3448
Date: Fri, 09 Apr 2021 17:10:43 +0200

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CVE-2021-3448

A flaw was found in dnsmasq in versions before 2.85. When configured to
use a specific server for a given network interface, dnsmasq uses a
fixed port while forwarding queries. An attacker on the network, able to
find the outgoing port used by dnsmasq, only needs to guess the random
transmission ID to forge a reply and get it accepted by dnsmasq. This
flaw makes a DNS Cache Poisoning attack much easier. The highest threat
from this vulnerability is to data integrity.

guix ships dnsmasq <at> 2.84. guix refresh shows version 2.85 is available,
and there are 43 dependent packages so this can go directly to master.

All dependent packages (refresh -l) build fine except for
python2-libvirt <at> 7.2.0, which is failing also on master
(libvirt-python requires Python >= 3.5 to build).  Since it's a python2
package and no other packages depends on it, can we just drop it?

Thanks, Nicolò

[0001-gnu-dnsmasq-Update-to-2.85.patch (text/x-patch, attachment)]

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